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Question
Find the following product: (x + 4) (x + 7)
Solution
Here, we will use the identity
\[\left( x + a \right)\left( x + b \right) = x^2 + \left( a + b \right)x + ab .\]
\[\left( x + 4 \right)\left( x + 7 \right)\]
\[ = x^2 + \left( 4 + 7 \right)x + 4 \times 7\]
\[ = x^2 + 11x + 28\]
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